«The Crime Club» by William Holt White

Already reluctantly faced with inheriting a vast fortune, Sir Paul Westerham finds his life complicated further when he surprises a ruffian in the act of rummaging through his kit-bag. By a strange coincidence, the very same scoundrel also happens to be blackmailing the woman whose portrait Westerham has become enamoured of! Will the multi-millionaire manage to frustrate Captain Melun and the Crime Club's evil designs to save the fair lady from ignominious ruin?