What is the main theme in the novel, Chance?

The major theme of all Spenser novels is Spenser's attempt to assert and reaffirm his romantic code of values in a hostile and resisting world. In Chance, Spenser's actions show many of the principles of his code: His independence is asserted in his refusal to allow Ventura to dictate the terms of his investigation, and in his defiance of Marty Anaheim; his ability to defend himself is displayed in his killing of two of three Russian hitmen who attack on Commonwealth Avenue and his climactic beating of Marty Anaheim; his love for Susan and loyalty to her is reaffirmed through their trip together and through Spenser's resistance to the charms of other women; finally, Spenser's tireless efforts to aid the relatively innocent, even at the risk of his life, are illustrated by his rescue of Bibi Anaheim from the power of her brutal husband.